ALEXAKDEB, VON HUMBOLDT. 121 rises to a height of 4500 to 4800 feet, was extremely remarkable, as much for its extent, as for its direction in the meridian, which was in a line standing perpen- dicularly tipon the equator from the pole, and which reminded Hnmboldt of a similar situation of the chain of Andes which he had explored in America* These Ural formations—beginning on the sea of Aral, with so-called tertiary formations,* and extending to the greenstone rock on the Arctic sea—contain gold and j>latiua in their northern and central portions, princi- pally where alluvial deposits predominate. This cir- cumstance xirged Humboldt to especially interesting inquiries, and he gained, spite of his short stay of four weeks, such important results, and new disclosures on the composition and formation of the gold and plati- num contained in alluvial soil, he discovered such alarge quantity of new minerals, and made sxich highly im- portant observations on the relative positions of the various rocky formations, that we should be more sur- prised if we did not know Humboldt's unwearying industry, and his uirusual and practised talent for observation. When, he had visited the malachitef pits of Zume- sclxefskoi, the remarkable magnetic xnoLintam, Bla- gotlacl, and the famed deposits of topaz and barytes, near Mursdnsk; after he had found a piece of pure platinum, weighing more than eight kilogrammes^ Bear Nischnei-Tigilsk, a district which reminded him of Choco, in South America; and when he had, be- sides this, fixed the astronomic position of several localities, and made several magnetic and altitude measurements, he continued his journey from Jekath- * By this Is understood the strata of earth lying "beneath the Buporficial layers of more modern times, and which consist of tipper peat,, of coarse lime, and of lower peat. f Malachite is carbonated oxide of copper. It is generally met wilib In veined radiating groups ; is of silky metre, and of a fine emerald grooii colour. It sometimes also occurs in coarse, earthy ma&ses, and wyntallizeB in irregular rhomboidal cones. $ A. kilogramme is nearly equal to two pounds six drachms.